PLATE XIII 



Plate XIII is from the upper surface of a section 

 through the intervertebral disc (Fibrocartilago interver- 

 tebralis IX) between the ninth and tenth thoracic verte- 

 brae posteriorly and the sternoxiphoid articulation anter- 

 iorly. The plane of the section is 1.9 cm. anteriorly and 2.1 

 cm. posteriorly below that of the last section, and is .2 cm. 

 lower behind than in front. 



The lowest portion of the pericardial cavity appears as 

 a shallow space separating the diaphragm from the fifth 

 left costal cartilage. In reality this space is occupied by 

 the tip of the apex of the heart, which by an oversight was 

 omitted from the plate. 



The oesophagus is turning to the left of the midplane 

 preparatory to entering the stomach in this section. The 

 upper pole of the spleen (Lien) comes nearly to the 

 surface of the section between the posterior surface of the 

 stomach and the diaphragm. 



98 



